The first wave would involve enough tools for already .net projects to invade into Linux land. If this wave is not big, then Microsoft will have to try harder to convince Java devs to make the switch. But I am sure, there are many like my employer who make fintech products that with some work expand on to the Linux Server side very motivated to be part of the first wave.

More Java developers, I would be observing how many .Net shops expand their products and services to Linux.