Has it been decided yet if garbage collection should be moved out of the core and only be provided as a library? If memory serves me right there was some discussion on this shortly after the 0.6 release [1][2].
Consensus is leaning towards moving it out into a library. The only undecided thing at this point appears to be the fate of the @ symbol, e.g. whether it should remain as sugar for user-provided pointer types (which includes types in the stdlib).