I was trying to update my netsuite jetbrains plugin today and kept running into an issue with Release Preview (RP) accounts and logging into them via SuiteTalk. I am using 2017.1 WSDL currently and it looks like the RP accounts are getting a domain with the <account id>-rp as the 1st part of the domain. When it attempts to log in, it gets an unknown host error. Not sure if any of you are going to test your integrations/apps but it doesn't seem like the RP account domain is working correctly for any account that I have access to.