I can see a stand alone version, but I am still not convinced that there will be a version to use with Android phones.
Nope. Android is under or around 50% of the market in the U.S., the U.K., Australia, Sweden, Japan, Ireland, Canada, and a few other countries. In those markets, opening the Apple Watch would add, at best, a market that is twice as big. However, many or most of those users, are buying inexpensive Android phones would not not be potential Apple Watch customers. In the rest of the world the potential Android Apple Watch customers are an even smaller percentage of the total Android market. That would result in at best a 25% - 50% potential market size increase, and a much smaller actual sales increase.