Password-protected archives with client were released: http://motocoin.org/#download.
Password will be announced at 20 May 2014, 20:00 UTC.
Source code will be released on github shortly after launch.

During first days after launch mining speed may be too fast. This may annoy you because every time someone mines a block your level will be automatically changed. This should be fixed after one or more difficulty retargets.

There is special reward for 3 developers of Motocoin - each developer will get 150k motocoins. There will be tens of millions of motocoins so 150k is not very large amount (and some currencies are 100% premined). Also this reward ensures that developers will have strong reason to support Motocoin.