So far the answer is No.
Here is a direct response from Games Workshop on the issue.
via a reader on Faeit 212
GW confirmed the baleful gates aren't limited. no need to run to eBay and pay double the MSRP.
Thank you for writing in to us! The Baleful Realmgates are a continuing item at this time, not limited, and we expect to get restocked in the near future.