I've just installed beta 2 and I'm not sure deinterlacing is working as it should. It's not showing scanlines most of the time but it feels like it should be smoother, and sometimes as camera shots change you'll briefly glimpse the scanlines. In the "video settings" menu "deinterlacing method" is set to "off" but greyed out. I've just upgraded from 7.0.3.012c and that seemed ok. This is while watching Live TV (Freeview HD in UK DVB-T2).
I tested deinterlacing on a few samples that I have and noticed no such behaviour. Can you provide a sample? Also make sure that you don't have any deinterlacer module parameters set in autostart.sh.