Daxdiv, here's my educated guess concerning the Blu-rays and episode count:
-A typical Funi Blu-ray box set for a 26-episode series spans three discs. This puts the average amount of episodes per disc to be about 8-9 (two discs have 9, while the other has 8). I don't own a Funi Blu-ray set, but that's my best guess just from looking at the packaging of shows like Witcrabroadlade and Champloo at Best Buy; anyone with a Blu-ray set can confirm this? Also, when they released D Grayman on Blu-ray, they split it up into multiple 13-episode, two-disc sets.
-Funi will most likely release this based on the arc format. I think it will be similar to their widescreen season sets. Meaning, the first set will be nothing but Saiyan Arc (1-39 DBZ Classic)
-The first Google result for "dragon ball kai saiyan arc" is the talkback thread here on TZ; according to JTP's edited first post, the last episode of the Saiyan arc was episode 16.
Therefore, my guess about the first Kai Blu-ray box will be that it will have 16 episodes spanning 2 discs, with eight episodes per disc. I'll have another guess about the Namek arc later.