g5 deal ?
Depends on the individual's situation.
For someone who already has an m4/3 I think I'd suggest that it is better to wait. You're only going to get an incremental increase in features and IQ.
For someone who is looking to get into m4/3, and doesn't want to spend a lot of money, the G5 package is an outstanding deal. You'd be off to a good start in m4/3 with very little outlay (though more expensive than a used system).