Bit #1: since the codex came out, the 5h edition faq is no longer valid and has been taken down... therefore the only rule saying we cannot use the guns in Fortifications no longer exists. Icarus Biocannons for everyone!
Bit #2: found this on Bell
"Speaking about the codex today, a few things fall into place. One of the older members of the Stoke branch is regular play tester for the pre release codex's as he has a number of armies they use when the designers want to try out their rules. Well it turns out he basically advised the design team that the NID codex was far too week and he basically walked over their armies, so they kept adding and changing the rules until it became such a mess that they stopped play testing the book. The white dwarf article was done in the released format because it became obvious that things did not work. They even toned down the riptides load out and tailored the report so it looked as if the new NID's could stand up to the best units in the game. it was a lie.http://greenblowfly.blogspot.com/2014/0 ... ds-to.html
"They basically ran out of time to publish the codex. To make it right, they would likely have to start over again, and the old one was already way behind.
"So somewhere along the line someone high up forced the release, the Models were obviously ready and the penny counters wanted a return, as it costs to sculpt, and they don't want molds sat there for another 6-12 months. The inventory was in supply or on order, so it had to be pushed out.
"Add to this that the reason we don't have the doom or parasite or pod was a hang over of the chapter-house law suit. When that went to court GW decided that they would not be making these models as the cost of the molds and time was too expensive. So the safest way to remove influence from chapter-house, was to make any of the disputed models obsolete. Remove them from the codex.
"We already had the design team at Nottingham give interviews saying they would put right the 5th edition codex, i wonder what they are going to say this time."
Salt to taste... but really difficult can it be? it's not like they don't have practice making codex ever before....