Two possible approaches:
- Gamble on the promise with the hopes of being rewarded with a gain that is commensurate with the additional risk taken
or
- Wait until after the official EOS blockchain is released next summer and acquire actual EOS tokens/coins. You'll miss you on some gains but surely not the bulk of long-term value
But don't forget, if you pick to wait for major release you may lose the opportunity to get really high gains
The difference could be 20x growth for the first choice and 50x for the second one. It is a huge difference.