I don't worry much about lineups, except when Fredi was hitting Heyward like 7th there for a while. According to the statistical community, all baseball teams fuck this up anyway in terms of lineup optimization. If you care, you can read more about it here:
http://www.beyondtheboxscore.com/2009/3/17/795946/optimizing-your-lineup-by
I am definitely pumped for this season. I love that the team finally made a move to try to win a World Series. That's been my biggest beef with the franchise going on about 10 years.
I do imagine Wren will try to find a veteran starter to maybe stash in AAA or in the bullpen in the event Teheran isn't ready or an injury occurs. No way you make it through the entire season with only 5 starters, and I'm not counting on much from Beachy this season. Someone like Oswalt would make sense. I'm also intrigued by Javy Vazquez if he indeed tries to make a comeback. Wren got Sheets last year, so I trust him to figure it out.
By the way, Wren has really done a great job as the Atlanta GM.