Yup I can confirm this, as today I tried to but Mi3 but failed to do so, but wat happened next is that one of my relative who was at my home today wanted to but Zenfone 5 8 gb and even it went out of stock by at around 3:00 pm.i heard from a friend who has knows someone working in flipkart -this is due to the exclusive deal they have with Motorola-the plan is the ones pissed with waiting shall buy the moto G, if they keep a regular fully stocked sale of Mi3, nobody would buy the moto G and it would suffer. this buffered sale is attracting a lot of traffic to the website and hence people who wont want to wait /impulse buy shall buy the next best alternative(in this case most probably the mtoto or the asus).
i can't confirm or verify this-but this is what i heard!
bitw even I need help buying one in the nxt round of sale