Actually, I did not take the information directly from Wikipedia (it inspired me though), but rather from
here since it was more comprehensive. Seriously though, the Su-32FN and the Su-34 are much of the same but for the name and the fact that the Su-32FN is the prototype version and the Su-34 is the production version). If you read the page over there, you might have a better view over the Su-34's capabilities and role(s).
About the concerns we have over the MiG-29K, I think that the Sukhoi's T-50K will much more potent than once it will be in operation, thus I do not really see the need for the MiG-29K in the game since it would most likely be superseded by the newer aircraft on Russia's sole carrier and when Russia's new carrier project gets completed. By the way, will Russia build a sizeable number of MiG-29K? I highly doubt it...
We both agree the MiG's LFMS project (based on both Project 1.42/44) is far from being close in getting an airplane in production, however they might just get something out eventually due to MiG's heavy lobby at the Kremlin. The need is there nevertheless.