Q. Should I wait for BS6 model or can I buy BS4 model - Jupiter?

If customer is price sensitive, pick-up BS4 (including an additional discount now at certain showrooms due to large BS4 inventory).If customer needs latest technology and want an environmentally friendlier engine, buy a BS6. This engine will also get a marginally better resale value (as the spares will be easily available for longer duration than BS4 engine parts).

Wait for the BS6 model because it's going to be a tweaked engine and exhaust also TVs might add-up some nifty features!

Before purchase test ride will satisfy your purpose