Lumia CyanJoe Belfiore has just tweeted saying,

So, we can expect a solution to the error 0x80188308, which has stopped many developers preview devices form getting GDR1. Seems, Microsoft will also sort out GDR1 update issues for HTC devices with these fresh updates. Lumia Cyan will also come to rest of the devices running Developers preview, as promised by Joe before. Till now only, Lumia 1020, Lumia 1520 on AT&T, Lumia 920 on T-Mobile Germany and Lumia 1520’s UK country variant have received Lumia Cyan, while running developers preview.