Linden Lab's CEO Ebbe Altberg just publicly announced the offcial name for the next generation of the virtual world created by LL will be for now Project Sansar and the final name will be TBD.
They - Linden Labs - don't want to encourage the SL 2.0 name as it may suggest "too many assumptions about how similar or how linear the progression from SL to this new platform will be". Also because SL and this new platform - Project Sansar and in the end TBD - will be functioning "side by side for a long time" so it's to avoid any confusion on users part.
This news - and some more details - where announced at the SVVR 2015 - Sillicon Valley Virtual Reality Conference & Expo in San Jose, CA.
You can watch the presentation on YouTube here, his presentation starts at 39 minutes mark
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