Concerning this aleged T50 no. 9 I did some research behind .... and it seems as if indeed some sort of typical Russian-media hype is involved:
Following the original Zvezda statement, "Девятый самолет ПАК ФА выходит из опытной партии" = "Ninth aircraft PAK-FA exits/leaves from the experimental batch" he actually said nothing that it flew, maybe not even that it is finished: More likely it seems as if he is saying that ninth T-50 will be more serial-like, which is in line with what the infamous Azohen Vey said that T-50-9 should be complete in terms of electronics. Borisov didnt say directly a new prototype has joined the ranks.
So this is not ninth T-50 prototype in total, and even less 10'th flying (like some fan-boys already assume) T-50 because in reality there were two different T-50-5's, but it is simply easier to refer to T-50-8 as ninth.
1. T50-0
2. T50-1 (051)
3. T50-2 (052)
4. T50-3 (053)
5. T50-4 (054)
6. T50-5 no longer but now T50-6-1 = T50-5R (055)
7. T50-6-2 (056)
8. T50-7 = static test specimen (??)
9. T50-8 unconfirmed (??)
As such he is even most likely counting these 9 aircraft not as flying prototypes but simply the 6 flying as of now (T50-1, 2, 3, 4, 5R, 6-2) and the two static frames -0 and -7 and now T50-8.
But as usual ... all what sounds good is fine even if the truth is a bit different.
Deino