hi Martin,
First thing, Agentry will not come as a separate installation pack in SMP3.0. Its included as one more component in SMP 3.0 - Agentry toolkit.
Secondly, I guess SMP 3.0 will be released for developer edition and production edition as they did in earlier versions of SMP. But it seems no official documents available so far.
Regards
Yokesvaran Kumarasamy