After many comma requests, now all numbers larger than 1k should have commas in them in the battle log. If you notice a place where there isn't one feel free to post here.
Also, in addition to this, spells will now show up for each minion they are cast on, ie:
Bearings cast Dispel Magic on all enemy Minions (8,138,880)
Get cast Ethereal Chains on Mick Taylor (1,207,959)
Get cast Ethereal Chains on Grotesque (1,207,959)
Get cast Ethereal Chains on The Reaper (1,207,959)
Get cast Guardian Angel on all friendly Minions (0)
-Epitaph cast Ablative Shield on Bearings (10,017,023)
-Epitaph cast Ablative Shield on Thy (7,365,461)
-Epitaph cast Ablative Shield on Get (10,017,023)
-Epitaph cast Ablative Shield on -Epitaph (10,017,023)
Reference:
http://www.carnageblender.com/bboard/q-and-a-fetch-msg.tcl?msg_id=003G1T