GR say they could be flying earlier than October, but I can't see a full phase-in of the 228s and retirement of the Tris by then somehow. If you really want the full monty you could do worse than to book SOU-ACI-GCI-DNR-GCI-ACI-SOU this side of late July - not cheap (probably £400) but you'd get the full experience - or simply SOU-ACI-GCI-ACI-SOU - for a bit less.