This may have been covered elsewhere but I am very disappointed that Poser 14 will be Windows only as that will end my 20 year relationship with Poser and force me into the arms of Daz.

I feel like this is another nail in the coffin of the program. I know it takes resources to support but this means I wont be buying any more poser content from Renderosity and will be migrating to DAZ. I am not a fan of Daz business practices and am reluctant to support them but now I have no option.

This is a huge pity and feels like Poser is slowly dying.

Nerd gave us explanations why: https://www.renderosity.com/forums/comments/4494165/permalink

Thats one qestion. Another is: Will it be possible then to use P13 locally without net-connection when bondware will quit P13 for mac? (and maybe quit itself?)

IMO, the right to use is linked to connection to their server from time to time, whatever the version and the OS. Same applies to Poser 11 and Poser 12, so I think that you don't need to  worry about this aspect

The license servers for Mac and PC are the same. You can continue to use Poser 13 until Apple breaks it beyond repair. That will probably the next OS update given their track record.