I was actually answering to that question, but probably I wasn't clear enough. English is second language for me, sometimes I have it difficult to explain nuances.
Color rendering and color tone are related, but are not the same thing:
-Color tone is the "tint" of the light itself, as seen viewed directly or reflected on a white wall. It is defined by its chromaticity coordinates on a color space. The most used are the CIE 1931 (x,y) and the CIELUVW (u',v'). The coordinates defines the color appearance of the light. A given color appearance may be obtained with miriads of different spectrums, so while a given spectrum of light defines an unique set of coordinates, you can't associate directly a set of coordinates to any concrete spectrum.
Thus you can get same coordinates with different spectrums.
The planckian Locus is a line that crosses the color space, being each point of it the chromaticity coordinates of all black body radiators (for each temperature in K). As for lights with CCT below 5000K, the reference for CRI is black body radiators, by definition BB radiators have CRI 100.
But you can get same chromaticity coordinates than a BB radiator with a different spectrum. In this case, the tint of the light is the same for both. But they wont render colors the same because their spectrum is different.
On the other hand, you can obtain a very similar color rendering with lights that have different chromaticity coordinates.
-Color rendering is a very complex topic. The thread started about the CRI marketing ploys: how lighting manufacturers uses the flaws on the CRI calculation to releases lamps with high CRI figures but that it not always result on the excellent color rendering it should credit.
So when you ask
SO: if I get a 90+ CRI led bulb (such as the new Philips L-Prize Winner or any 90 CRI rated bulb), should I expect both tint colour and colour rendering close to a heated filament? I.e. should I expect that this bulb with mimic an incandescent light as the 90 XP-G does?
the answer is more complex that you may think initially, requiring different explanations over the many questions in that phrase. As tint color and color rendering are different things, answer is different for both:
-Tint color of a 90+ CRI should be similar to a incan/halogen of same color temperature (CCT)?
Not necessarily.
It will be very similar if the distance of the 90+CRI light to the planckian locus is very small or nill (in which case, the tint will be exactly the same). This distance is called Duv and you can get it on the reports of quality brands lamps. In the example cited, the Phillips L-Prize lamp has a Duv of 0.00135 with a CCT of 2810K. That Duv correspond to a little more than 2M (McAdam ellipse), where 90% of persons notice the difference, although it is small and very acceptable for most people.
However, ANSI areas for SSL covers 7M which is a different of tint very noticeable for anybody. So you dont have any guarantee for many products than their 90+CRI LEDs actually have a tint very close toa incan of same CCT.
Lately many LED manufacturers are offering tighter bin areas with 3M diameter. With product using that binning and that provides good color stability along lifetime, you can expect a very close tint to incans.
-Color rendering of a 90+CRI part should be very close to an incan of same CCT?
Theoretically, it should, as it is what supposedly CRI measures.
In the practice, it is not so clear due CRI metric has many flaws and manufacturers uses them to get high CRI figures to lights which not render colors as close as that figure should guarantee.
The most apparent flaw of the CRI calculation is the inadequate samples. No any of them represent saturated colors, and red tones are mostly missed. Thus you can get a very high CRI for a light which renders red tones very poorly or which makes very poorly for saturated colors (along all the spectrum).
And actually, probably the most valued characteristic of incans is how they enhance the red tones. Due that, many manufacturers currently report R9, the figure of CRI for the 9th sample, which is not included in the general CRI (Ra) figure. R9 is a good figure to know how the light renders red tones.
The shorter answer to the question is you can expect a 90+CRI light render colors very close to incandescent if its R9 figure is very high too. Unfortunately, little LEDs achieves it for the moment. Best ones are those that reach a R9 of 80. The Phillips L-Prize has R9=78. Good but not so much, you will notice the difference on red tones and specially, on saturated ones.