They are only doing a few rows per plane, 4 I believe. Further, and not a good sign perhaps for E+ on UACO, is that DL will charge some elites for this. This may be because of the limited quantity of seats.

With regard to DL matching AF and KLM, I have ridden in KLM's E+ product in a 747 and 777-330ER. The 747 was great (has its own cabin b/t BizFirst and the staircase), the 777 was only about 2 more inches. On KLM it is really needed as 10 across for 11hrs on that 777 was TIGHT.