Release drivers for the B2G project recently got together to discuss committing 
to a specific Gecko version for B2G v1**, and we've all agreed on Gecko 17 
making the most sense from the point of view of technical requirements, 
resourcing, testing, and timelines. Platform changes for B2G have been 
occurring on mozilla-central, and builds of B2G will continue to pull in 
mozilla-central's Gecko until the 8/27 merge.

At that time, Gecko 17 will move from mozilla-central to mozilla-aurora. Active 
Gecko platform changes in support of B2G v1 will move to mozilla-aurora, with 
changes of course being merged back to m-c as well. Intermediate deliverables 
would be built using Gecko from mozilla-aurora. And contributed "B2G v2" 
platform work could continue on mozilla-central.

On 10/7, we'll similarly move active B2G v1 platform development to 
mozilla-beta, and on 11/19 work will move to the mozilla-esr17 branch. A notice 
referencing this dev.platform post will be sent to the enterprise list shortly 
for comment, as some of the ESR goals in [1] will need to change slightly.

We've discussed concerns around actively developing a 1.0 product while the 
underlying version of Gecko moves through the trains (mostly from a B2G 
regressing desktop/mobile/ESR point of view). The large majority of 
cross-platform architectural changes will occur before FF17 comes off of m-c, 
and most of the fixes in support of B2G that happen after that date will be 
B2G-specific. For that reason, we mostly see benefit to the cross-pollination 
of testing that will occur between B2G and other Gecko 17 supported platforms.

One thing to keep in mind is that B2G is now an equal citizen on branches 
carrying FF17. Except in extreme circumstances, any desktop/mobile change that 
negatively impacts B2G builds in a significant way will be backed out (and vice 
versa).

Please let us know if you have any questions, or if anything could use further 
clarification. Please also see [2] for a similar conversation happening around 
Gaia v1 convergence if interested. Thanks!

-Alex Keybl
Release Manager, Mozilla


** Please note that "B2G v1" just denotes the first version of the B2G project 
available on publicly available hardware
[1] https://wiki.mozilla.org/Enterprise/Firefox/ExtendedSupport:Proposal
[2] 
https://groups.google.com/group/mozilla.dev.gaia/browse_thread/thread/008812000dccb65c#
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