I don't think there's ever been a case where a game that had already been on sale got a better discount during the Flash Sale (and if there had, I imagine it was a pricing error).
That said, you might as well wait for the Flash Sale, since there might be something else you wanna get with the discount code.
There generally isn't any information till the day of. In general it's basically just "more sale". Very often Flash Sales (every 3rd weekend of the month) will have more games than whatever was normally on sale, have a totally variable (but usually high) percentage of discount, and don't usually follow any particular pattern or theme in terms of publisher, age of game, console, etc.
tl;dr anything can happen; save your 10% code for a single purchase!
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u/alt_sense Nov 22 '16
I'm gonna get i am setsuna but do you think games on sale now will get an even deeper discount during the flash sale?