Why no Magento connect or interface to install extension in Magento 2.0 & can we expect it in next release ?
Magento Marketplace (Connect) for Magento 2.0 is not ready yet. I expect it will be ready in the next 2-3 months.
Not marketplace, I meant the interface provided under Magento Admin to install Magento extension like Magento connect in Magento 1.x ?
Magento Marketplace (Connect) and Magento Backend interface to the Connect are opposite ends of the same tool. They will be in the next Magento 2 releases.