The IL-2 Sturmovik Forum has details on a new patch that's now available for IL-2 Sturmovik: Battle of Stalingrad, also announcing they are commencing early access to the first plane from IL-2 Sturmovik: Battle of Moscow for those who preordered the Premium Edition of the combat flight simulator (thanks Olaf). Here's word on plans for more test flights over the coming months:

Today we're not only deploying the major update 1.101 but also we're starting the long-awaited early access to IL-2 Sturmovik: Battle of Moscow! This is an important step in the project's development, and we're proud that together with the testers we managed to release this new version in schedule, without any delay.

Everyone who's pre-ordered (or will pre-order) Premium edition of BOM gets access to the first game's plane - I-16 type 24. The release plan for 4 more aircraft is as follows:

August - MC.202 Series VIII
September - P-40 E-1
October - Bf 109 E-7
November - Bf 110 E-2

Owners of Standard edition pre-order will get access to the early game builds of BOM later in October 2015.