This is just a practice tournament. Do not get over excited with this win. The main match will happen when the T20 world cup will commence. If Bangladesh can perform the same way that they have with Australia and New Zealand then they will be a team to reckon in this Worldcup. Btw, amazing performance by the Bangladesh team.
Obviously sub-continent teams will be at an advantage, since the pitches in UAE/Oman are similar to those in India and Bangladesh. And Pakistan and Afghanistan will be having an added advantage, since they have played a lot in these grounds. Also, a lot of Pakistani and Afghan players regularly take part in the T20/T10 leagues organized by the ECB and the Oman cricket board. The real challenge will be for teams like New Zealand. If they can't adjust with the conditions, then they will be in a very bad state.