Just in order to try to put it more or less right:
The RuAF is still pondering what its posture/doctrine/battle orders will be in the next decade(s), so it's very likely that all current plans will/are undergoing change and modification of some sort.
Latest rumours are:
1. The air force guys are not totally satisfied with the current SM mod of the typical Flanker, they want the more advanced SM2 instead (logically)
2. Similarly (but the other way round) they are not satisfied with the current M2 mod of the Fencer, they want the much cheaper but almost exactly as efficient M1 version (that has the huge merit - in costs/efficiency terms - to originate not from Pogosyan's head, but from a competitors' R&D)
3. The current layout of the future force evolution is supposed to be like this:
- gradual phase out of early Fulcrums, replacement/need of replacement still debated
- vintage Flankers to be replaced by SM (1,5 - now - to max 3 regiment-strong force) and SM 2 (more or less 30% of current Flankers): "affordable multirole", rest with latest Su-35 (total multirole non-stealth, some Fencer and Fullback overlap, and export of course)
- phase out of most Frogfoots, a max figure of 70+ retained as modernised versions (precision attack, PGMs) till 2015/2020
- PAK FA gradually replacing remaining Su-27/MiG-31 (and forthcoming Su-27SM/SM2 and MiG-31BM in the air superiority role) in tandem with the Su-35
- MiG-31 will remain in service till the 2020s or maybe even 2030s if its BM version proves good, otherwise phase out since 2014-2015 and replaced by Su-35/airborne AEW assets + PAK FA mix.
- The future of the Su-32/Su-27IB/Su-34 whatever (i.e. Fullback or whatever) is still uncertain (despite pilots' conversion at Lipetsk and the second serial prod "bort" flying, because it is still not clear whether its role can be fulfilled by modernised Fencers/Backfires and Su-35 much better and in a more affordable manner.
- Backfires are finally set to go on till at least 2015, with unspecified modernisations (that could kill the Su-34 eventually). If not, the Su-34 will replace all Fencers and Backfires from 2015-2020 on.
- and (last but not least), as an anecdote, rumour has it that some of the remaining vintage Foxbats will be modified as unmanned recce platforms (:D)