I think Sony will do what the do best this gen, screw it all up. Not sure about halo rts, but alan wake and ninja blade along with gta dlc will do well. However, how that will get more people to purchase a 360, I have no idea!
There are more reasons to buy a ps3 this year; price drop, killzone2, god of war 3, gt5 and hopefully, yakuza 3.
Whoever wants a halo rts more then likely already owns a 360, but apparently there are approximately 40% of ps2 owners who still haven't made the jump to a current gen console yet. This 40% may have some good reasons to pick up a ps3 this march.
I agree with the marketing, but they also need to Market the eye toy and produce more software for it. The eye toy has a lot of potential and can possibly win over some casual gamers looking for more then a wii.
Knowing Sony though, they will throw away the advantage they have and ms will laugh away to another victorious year with the 360.