Nice of you to drop in, HA!
(This is my first ever article on Comicbookmovie.com, please be gentle.)
A recent listing in the German Amazon website gives us a date and price for the third game (first in continuity) of the Arkham series. This edition is set to release on the 21st of August, with a price tag of 39,95EUR (around 55$ and 32£).
Warner Interactive is yet to make a comment about the veracity of this information.
If any update comes, you'll be the first to know. In the meanwhile, thank you for reading my first article.