This could be termed security-through-obscurity, but if you need to reverse engineer a complex processor in LBGA256 on an 8-layer board that you only have one of, that datasheet is going to be very helpful.
There is a "data brief" available. It doesn't have that much useful, it is for marketing:
(I didn't say "Most urgently" - they oddly edit the posts)
"i will forward your request to the Marketing guys."
This is code for "you aren't getting them"
SPC5-STUDIO has a "pin wizard" letting you see the pinouts.
Back to the forums.
"if the marketing guys are ok"
Well, they never replied to me so I guess they weren't.
What's the next thing to look at? Development boards.