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lets see I definetly see lots of people taking the first multi class feat for an extra encounter /per day power and skill training

cleric haven't seen the 2 paths only one so far so not sure but the blaster cleric we've already seen looks like it could get a lot of use out of ranger training giving him hunters quarry 1/encounter for an extra d6 to all attacks on a single target

fighter haven't really seen what its secondary stats are going to be but once again ranger not a bad choice for 1/encounter hunters quarry

paladin could easily pick up some warlord or warlock stuff as it seems cha is important to them.

ranger archer types could pick up paladin training for divine challenge abuse
and TWF could pick up rogue training to pick up sneak attack once per encounter with the offhand weapon which could easily be a light blade.

rogue brute could pick up some ranger for extra damage with hunters quarry and possibly deepening into a few TWF Powers later charismatic could hit up warlock for eye bite when he manages to get into a position thats just a bit too dangerous or ranger once again for hunters quarry and TWF

Warlock could go for paladin to abuse divine challenge

Warlord tactical could easily pick up a bit of wizard training for ray of frost
inspiring could pick up warlock for a bit of fun as well.

and all of this is just off preview info we don't know how much synergy realy exists.