Update: Three has announced that it'll carry the Galaxy Nexus in the UK.
Samsung and Google have just announced the initial launch plans for the new Samsung Galaxy Nexus on-stage at the Samsung Unpacked event in Hong Kong. The phone will launch in November in the US, Europe and Asia, including Japan, where it'll be available on NTT DoCoMo. No word on network availability for the US or EU just yet -- often carriers like to make these announcements themselves.
We'll keep you posted as more details of network availability emerges.