There are so many things, so many projects going on in parallel with the Ethereum blockchain, it's amazing... casper, sharding, plasma, ETH supply cap,...
But everything is still to come, experimental, and nothing seems to be in the production phase. Like in the case of sharding:
As Zamfir noted, however, there is currently a lack of a mechanism to send transaction fees and routing messages from one shard to another
And, it's like that, month after month. So, it makes me wonder, if they know what they are doing?