I think they are talking bout the small Tata Sky logo and its position. Previously the logo was big similar to SD channels but now the logo is small similar to HD channels.
Also Tata Sky has moved the logo position. Its a clever move actually! Since downscaled HD feeds contain black bars at top and bottom, most of the people use TV's Zoom feature to watch the channel in full screen which causes Tata Sky logo to disappear. Now they have placed the logo above the black bar which will always show Tata Sky logo even if we use Zoom feature of our TV.
Same thing they have done with MTV Indies SD feed.