I probably had 6 or 7 stacks of 999 enhancement cores before the expansion dropped. After I grabbed the 10 from the Weekly Rewards track I took a look at my inventory, and those are the only 10 cores I have. The inventory is looking VERY empty for the most part, but I don't know exactly what would have been cleared out post-update. I have all of my shards, alloys, ciphers and prisms... but the enhancement cores have vanished.