No. Tata Sky did run scroll informing about LCN changes. Check this
Discussion - General News & Updates About Tata Sky
Also same was communicated in advance by cust care and updated on website.
We r being too quick in concluding that LCN changes r about to happen. As i have said there is no information available publicly on this, neither from operator or broadcasters. Also similar is scenario incase of sat migration. Please wait for official response before decoding the exact roadmap and how things gradually r implemented