ARK also provides a more decentralized voting system than other DPoS consensus models, including Lisk.
Development will go to a different direction, but currently there are only a few changes (as far as I know), cleaning up the Lisk code, setting the stage for changes to come.
It will take time, effort and money to implement everything. Hence the TEC.
Also, there is nothing to see at GitHub yet. ARK will be open source of course, but the TEC hasn't even started, so the core is in a closed repo at the moment.