Technically, not much.
But there is a lot of discussion going on about the block size limit and the 80byte op_return size limit.
I don't like all this blabla without boomboom, so now I'm highlighting that before me, nobody ever used an OP_RETURN transaction.
So let's try to use what we have first, before we start discussing what we need more.
And apart form that, I'm having fun and I'm very proud that the first "graffiti" on the chain holds my name