Nice to know, how to install / configure it, but I still do not know, if and how this will work, when a server crash and has to fail over from Node1 to Node2.

Will all tempdb-writes replicated (synchron or asynchron?) or will all open transactions be rolled back? What, if I created a #temp-table or a global ##temptable e.g. in SSMS. Will they be available (and filled) after the fail over?

The main reason for tempdb on local SSDs is performance, but any benefit would be lost, if there would be some sort of synchronisation between the nodes, on the other hand I would need a sync, when I depend on tempdb-content.