While I still don't care much for the PT, I think it's probably smart to push Ep. 2 & 3 closer together like that, after that embarrassing TPM flop earlier this year. As was mentioned, I think it'll help give the marketing and merchandise a nice boost heading into the holidays too. I think AOTC and ROTS will probably lend themselves to 3D conversion/viewing quite a bit better than TPM did as well, not to mention they obviously lack Jar Jar and are therefore far less despised. So I think they'll do a little better than TPM did in 3D, and ROTS can build off AOTC's momentum a bit.
I'm far more excited to see what's in store the following year for the OT though. I think if they're really smart, they'll release them all within a few months of eachother to really get a nice Star Wars buzz going, across both box office and merchandise. I rather liked the original idea of spreading them out annually so Hasbro could really market the shizz out of each movie and fill in some nice gaps with lesser known characters, or big ships, etc. behind the push of each movie's box office, but we saw how terrible that turned out for TPM, so I don't see that as a very viable option anymore, unfortunately.