DVR can upload more resolution (not only 320x240), it depend on the settings of DVR's video source. If DVR is set to 640x480 then CenterV2 can receive 640x480, 640x480 (deinterlace) or 320x240.
In v8.1 Matrix will support the following resolution...
1280x1024; 1600x1200; 1680x1050; 1920x1200, FullScreen
And GV-remote desktop will support file transfer too.
And new PTZ & 2-Way Audio functions hope it good for you