Based on the pic I have seen. The A2 has 1-Optical digital out, 1-HDMI A/V 1.2a out for HD digital audio, no coax digital out (and the analog R&L RCA). Some may need the coax for their system configurations. It is more ususal than not that these players have included coax outs, so it's not an unreasonable gripe.
The A2 lacks 5.1 analog outs, so one must have a receiver with HDMI A/V vers. 1.1 (or above) to fully realize the true potential of the "uncompressed" audio from Dolby and DTS. However, the sound IS much improved even through the optical digital out (as mentioned earlier)
I will be happy to use my optical digital inputs with my forthcoming A2 until I upgrade later.
Once again that's just my take...