fumanchu314159, there is no announcement about that. So, we would have to wait and see. However, we should distinguish two things: (i) Kindle's technical ability to display whatever language; and (ii) Amazon's
"official" support for that language on the Kindle.
As an example, Kindle 3 can display
Greek (including polytonic),
Russian,
Chinese, etc. However, Amazon refuses to "support" those languages. This means that if there are any issues with these languages, you are on your own. It also means that Amazon would
not allow books in these languages to be sold in its store (I've tried).
Software "unofficial" support of these languages did not require some special coding on the part of Amazon (Unicode was already supported). All they had to do is include the additional Unicode ranges into the font. Implementation of RTL languages would most likely require additional effort and expense for them, so I do not expect them to include the RTL support ... unless in some unlikely scenario they decide to enter RTL markets.