I don't know, they contracted for them to be made. This is the original release fro Software Hut's page:
April 24, 2009 Update - Software Hut and GVP have teamed to bring back many popular GVP products for the Amiga at new, lower prices. These are newly made production pieces with a full 1 year warranty. Many of the items are limited production so hurry as they will sell out fast. Our first batch of ram both 4mb and 16mb simms has arrived today and A2000 and A4000 accelerators are due in stock on Monday. A1200 accelerators should be the end of next week and the Spectrum boards should be in around May 5th.
It's taken longer than expected, but the A1200 and A4000 accelerator boards were already produced, and now the GVP Spectrum boards are completed and selling.
Visit
http://www.softhut.com for more info - but e-mail them for up-to-date information.
Joe from Software Hut e-mailed me yesterday saying the new Spectrum boards have arrived, and that he is shipping mine out today.