Battle Frontier boxset 2 AND Diamond and Pearl boxset 1 will both be released 16th September 2008
Battle Frontier boxset 2
Diamond and Pearl boxset 1
Battle Frontier boxset 2 costs $29.99 at the moment on this site - (Retail price $39.98) 520 Minutes
DP boxset 1 costs $18.74 at the moment on this site - (Retail price $24.98) - 374 Minutes
Also, there will be more "All Stars" Volume 11 (Meowth), 12 Treecko and 13 and 14 which are currently unknown.
For some reason, they're also releasing a Volume 1 and Volume 2 on the same day of the release of the DP boxset. The DP boxset will contain all the episodes that volume 1 and 2 have.