Last things first. ;-) Yes, you can do the mining with the wallet application because the daemon is always included.

Currently you can't download the wallet software. It will become available no later than the ICO ends. Maybe this happens earlier during the ICO.

During the PRE ICO there will be a handfull of testers that will able to run software. You can apply now via private message or via ticket on www.goldeneracoin.com until the 8th of august.