No secrets here, as rear panel pictures of the BDP-83 have been public domain since September.

For Model 990 users in general, the obvious connection priority is the 7.1 analog output (using either 5.1 or the full 7.1 depending on your speakers). You could also connect coaxial or optical to let the Model 990 do the decoding and DSP for DVD's and CD's (this is how I set up my 983H and previous universal DVD players). The best bet for video output is the HDMI connection, both because it allows up to 1080p (24 or 60) and because it is the only way to get the ABT hardware involved. You can either use the 990's DVI switching (if you have a couple DVI/HDMI sources) or go straight to the display. If you don't have DVI-HDCP or HDMI on the TV, you can go with component video instead.

For your specific case, your plan sounds good. Migrate the DV-45A's multichannel analog and coaxial digital audio over to the BDP-83 and go straight to the Kuro with HDMI. I'm still refraining from offering comments on performance, but I'll toss out the option of hooking the BDP-83's stereo analog output to the CD connection on the 990 and letting it to CD's as well (or for that matter letting coaxial handle it). I don't know that it's necessary to commit to a course of action now, but I'd be curious to hear how you think the two stack up for standard CD performance. Personally, I'm about to remove my HD-A2 from the rack and am trying to decide where the 983H will live once testing is done, since my plan is to let the BDP-83 handle all of my disc playing duties.