It looks like, currently, motherboard manufacturers have split into two groups: members of the first one (Asus and MSI) offer end-user update BIOS of Socket AM3 boards in order to have support for Socket AM3+ CPUs, codename Bulldozer, while the other group (Gigabyte and ASRock) insist on releasing a totally new line-up of motherboard with true Socket AM3+. As far as it goes, both ways are legit since the main advantage of Socket AM3+ of the old one is more precise temperature readings and fans speed control.
According to ATI-Forum.de leaked slide from Gigabyte’s latest presentation Socket AM3+ processors will be released on 7th of June 2011. Earlier it was though that first Zambezi processors will see the light on 20th of June.
Intersecting to note, Gigabyte sets the announcement date for AMD’s latest FX-series CPUs to the time Computex 2011 is held, though the last should end by 4th of June. It was also mentioned somewhere on the vasts of Internet that new processors can be announced during E3 event (7-9 June). But it is also possible that the launch of Socket AM3+ processors could be a standalone event and not connected to any other activities. More details on FX- series processor specs can be found here.