There is no confirmation post from Blizzard.
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http://www.wowhead.com/item=114232/t...e&bonus=19:525
there are 2 randoms on crafted gear. Firstly getting your Of the XXX and then the stat roll itself.
Code:
From wowhead - truesteel breastplate of the fireflash
+93-139 Crit
+93-139 Haste
So you should get a max total secondary stats of ~232 (I've seen this +/- a few points, probably decimal rounding) from the Stage 1 chest.
You can reroll the same suffix and just get different ratios.
When you upgrade though, it keeps the ratios and you just get a boost to the secondaries.
Rerolls become a lot cheaper come the patch so wait for that if you want to get something else.