I'm neither a vegetarian nor Indian but of all the cuisines I've experienced I think Southern Indian vegetarian is my favorite so I'm excited about two new restaurants.
The people from Shiv Sagar have already opened a place just called Sagar. It's on Hillcroft, just across from Shri Balaji Bhavan and only a couple of blocks from SS. I think this is the space formerly occupied by Bismillah?
"Mumbai style street food" should mean things like the things Bansuri Indian Food truck, which I love.
Coming soon in the near future is Maharajah Bhog, on the SW Fwy @ Gessner. This is the same strip center with Peking Cuisine with which many hounds will be familiar.
This one is technically a chain, I guess, but there are only 3 other locations in the world, 2 in Mumbai and one in Dubai and this one, which just happens to be within walking distance of my place, so I'm really looking forward to trying it out. My experiences with Sankalp in Sugar Land last year indicated that 'chain restaurant' in India may not necessarily be an indicator of mediocrity or 'lowest common denominator' food. Looks like the menu is largely Gujurati and Rajasthani.