regarding to newsletter today: http://download2.mikrotik.com/news-42.pdf
it says that RouterOS 6rc3 has latest kernel with drivers (3.3.5), which is not true, latest is 3.4 with additional drivers which is few months old kernel and still not implement in RouterOS.
I believe this is big feature, since drivers are included for Microsoft Hyper-V virtualization, and MikroTik can do the routing job being inside virtual machine (which last time worked with RouterOS 4.x).
Also there is separated thread that speaks about it in feature requests few months ago.
Please do something about making kernel 3.4 available inside final RouterOS 6