I can't believe I missed the last episode of Cheers!!
I was wondering where are the character's now??
For example, is there any mention of them of Frasier about what's happening in their lives?

This is about the characters, not the actors

I guess you are referring to the season finale. Well in it Sam comes to his senses and decides not to marry Diane and fly away to California. The gang pretty much sits in the bar smoking cigars and talking about the meaning of life. You pretty much know that they are going to go on living there lives like any other day at cheers. But it feels really final.