It's going to be the DV88plus fitted with the DVD-A board as standard from the factory.
I believe it will be called the DV89.
I own the DV88plus, which come January, I will be able to pay £200 and have it upgraded by having the DVD-Audio board fitted by an Arcam dealer ,if I wanted.
It all depends on if you actually want DVD-A or not. If you buy the DV88plus now, you have the option at a later date rather than coughing up another £200 now.
Personally, I will wait until there are a few more main stream titles available before I contemplate upgrading.
That's one of the many benefits of buying Arcam. You can upgrade your player so it is always up to date and not out of date and obsolete.
Hope this helps