Most likely to make it this year: Andre Johnson, easily. He has made it before so he at least has his name out there somewhat and is regarded by most people outside of this area (and many in this area) as easily the best player on this team, one of the few that has some name recognition nation-wide. With the addition of Moulds and the new offense I think Andre is definitely capable of putting up huge numbers this year, and I think competition for Pro Bowl WR in the AFC is relatively slim compared to some other positions (Chad Johnson, Marvin Harrison, then Chris Chambers and a decent fall off from there).
Others that have a chance: Dunta Robinson. He is starting to get some recognition and should have made the Pro Bowl his rookie year. I think with a vastly improved pass rush he will get more opportunities to make some plays this year and could put up the numbers to propel himself into the Pro Bowl.
David Carr. He has an outside chance, although we would likely have to go at least 8-8 and he'd have to have very good numbers to downplay his less-than-admirable reputation thusfar. With the likes of Peyton Manning, Carson Palmer, Tom Brady, Trent Green, etc. in the AFC he will have to outplay them by a decent margin to get votes over them.
Mario Williams. He definitely has the talent and physical abilities to make a huge impact this year, and with our much more aggressive defensive scheme he could put together a Pro Bowl season. I would love to see it to help squash some of these rampant complaints about our draft choice, and I think he has enough name recognition that he won't have to put up huge numbers to make it (i.e. unlike Carr he won't have to vastly outperform his peers in order to get votes). His main competition will be guys like Dwight Freeney, Jason Taylor, etc. and he's definitely capable of putting up comparable or even superior numbers. He is definitely a candidate for DROY.
Demeco Ryans. It looks like he could end up being our starting MLB. If that's the case he's definitely in a position to put up a lot of stats, and he's good enough that I think he'll make do on the majority of his opportunities. He could have an immediate breakout year like Jonathan Vilma did, and is a personal preseason candidate for DROY.