Marte - I'd say it depends on the Braves OF, though most likely I don't see him coming up till the end of the year. He was off to a hot start in AAA, but has slowed down significantly since. He needs more time in AAA to gain experience.
Cappy - Who knows since he is on the Brewers. Could take a couple of RP's or a SP sucking and he could get the call. (edit: oh yeah ... needs to actually pitch well in the minors too)
Kotchman - Whenever Erstad gets hurt? Also Kotchman has gotten off to an awful start in AAA, I doubt he will be called up soon.... prolly end of the year.
Felix - I'd say around the All-Star break is a good time table for him. He really isn't being challeneged in AAA that much, but they want to keep him down to control his innings/pitch count.
Floyd - Really depends on if someone in the rotation gets hurt and when.