I recently met a community member that was trying to gift the SC2 digital bundle. Looking into it I found that indeed it doesn't seem possible.

Starting here, if one clicks on "Buy Now",:
http://postimg.org/image/5pbgqmf5v/

It takes them to the Digital Bundle option:
http://postimg.org/image/sbu5ckktb/

Continuing on moves to the check out:
http://postimg.org/image/av66b3oir/

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So far so good, however, If one clicks on "Gift":
http://postimg.org/image/uik7bhan5/

It skips the Digital Bungle screen and goes right to check out:
http://postimg.org/image/vnbjk7hqh/


If this is intentional for some reason, hopefully it can be made available in the future.
Edited by Leviathan on 4/4/2014 12:16 PM PDT