Pre-launch deals are usually just marketing hype

Last year se I'm eyeing a 3BHK upgrade from my 2BHK in DLF Phase 3. Builders like BPTP Ltd. offer pre-launch, but is it a real discount? Brokers claim better deals, direct builder says no. Not sure if pre-launch mein sach mein savings hoti hai ya just hype. Anyone seen real benefits buying early near Dwarka Expressway?