Solicits for DC Comics due to ship in April 2007 have been posted on various websites: Comic Book Resources, Newsarama, Comics Continuum, IGN, ComicList, and The Official DC Site. Here's the Aquaman stuff I spotted:
Tad Williams continues to refine Kurt Busiek's ideas and add his own in Aquaman: Sword of Atlantis #51.
Aquaman will also be appearing in the World War III mini-series, planned for week 50 of 52, in Part 2: The Valiant. He may appear in other issues of the mini.
And the Silver Age Aquaman will also show up in Justice #11. The solicit mentions The Challenge of Aquaman, and Aquaman's son.
NOTE: There will be no Ripples Through Time today, because I think I'm going to make the day I put up the Aquaman solicits a scheduled break in the ripples.
In non-Aquaman items... well, there's only one that stands out so much I have to mention it:
I'm SO getting this. I don't want that red robot dude, but Ma Hunkel is a figure not to be missed.