All heirlooms were removed for now (there are no heirlooms in game, you are not the only one who lost them).
Once chadz finishes the coding, you will receive a number of heirloom points based on your current generation (number = generation-1) that you can spend to improve items, just like you chose an item when retiring.
For example, if you are now gen 4, you get 3 heirloom points. You can spend them as you want, either get one masterwork or 3 tempered, etc.
@ Liveon
Level 35 is ~150 million xp. With the new cap at 1450 xp it would take like 6 months reaching it, and all you get would be 4 extra attributes/skillpoints compared to a level 31. That's just a slight advantage, hardly gamebreaking.