Interessant question... In my opinion:
- If you have a trader approach, I think you should buy soon because the market is quite low actually (although it can go lower)
- With a technical approach, it is a bit different: if you are very confident in the project, you can invest now, so that when a product is released, you can make profit. Otherwise, you can wait a working product is released and then invest on the growth potential of the project. The last one is the less risky, and this is a long term investment.
You're free to choose, the market needs winners and loosers anyway.