Freelancer517, Alexandrea and myself are going to Myanmar via KL, Sept 21-29. We are a group of 7 (and might still increase). I'm not sure if we can still accommodate more joiners, but we can probably meet up there and share tips if you're also going there on the same dates.
Basically, here's what our itinerary looks like
Day 1: Manila, KL
Day 2: KL, Yangon
Day 3: Yangon, night bus to Bagan
Day 4: Bagan
Day 5: Bagan, night bus to Mandalay
Day 6: Mandalay
Day 7: Mandalay, night bus to Yangon
Day 8: Yangon, KL
Day 9: KL, Manila
We'll still decide on whether we want to spend an extra day in Bagan and just make Mandalay a day trip (or bypass it entirely).