Avanna is available for purchase-and-download as of 23rd of December
Official website : http://avanna-vocaloid.com/
For those who are avid users of engloids, I'm sure you have already heard of this splendid news Avanna developed by Zero-G is great for celtic-themed songs and she has a clear voice, not to mention a broad range of vocal.
Available for purchase at $95 and you can immediately download it after you've completed your transaction.
Other than that, they have also released 3 demo songs for everyone to have a listen.
Official Twitter : https://twitter.com/vocaloidavanna
Official Facebook page : https://www.facebook.com/VocaloidAvanna