Noting really special today, ... except that it is time for another debate about the increase of the initial CWND from currently max. 4 to N. Where N differs from month to month and vendor to vendor. Currently standard TCP is not seasoned to meet the new network environments. There are still networks with a BDP from 1980 - MANET, Sensor Networks and so on are typical examples. Google press ahead the thematic mainly because a increased initial CWND instantly enhance the user experience for a typical web session. Web sessions are a prominent example where the slow start algorithms start to increase the CWND while after ~3 iterations the slow start is interrupted because every byte is transmitted. So our HTTP biased world suffers from the initial CWND - no doubt. Google congestion control and CWND analysis on the other hand does not address topics beyond the scope of HTTP.
There is a lot of additional research required to adjust these TCP intrinsic values and tcpm already began to address this topic.
The discussion at lkml is a little bit more specific but it is also quite late (01:34:00 AM) in the night so I interrupted the lkml discussion as well as this blog post ... ;-)