A reddit post from earlier today from redditor I_SH*T_KARMA has shed some light on some of the new features that are to come with GDR3 for Windows Phone 8 users...
Source: http://www.phonearena.com/news/Alleged-Windows-Phone-8-GDR3-feature-list-leaked-out_id46240
Source: http://www.phonearena.com/news/Alleged-Windows-Phone-8-GDR3-feature-list-leaked-out_id46240