There are at least 4 questions that have come up, without clear answers, or the answers seem to be debatable.
Hive Tyrants
Winged Tyrant- Does it deepstrike?
-----There's a good debate going on about this in the rules forum, my opinion is they do.
Hive Commander- Is the Tyrant required to be on the table?
-----rumors indicate Tyrant must be on table.
Tyrant Guard- Shouldn't they be able to, you know, guard the Tyrant?
-----please?
Which reserves benifits "stack"?
Zoanthropes
Zoanthope Broods- One psychic test per brood, or per model?
----- Ran it as per model, just to be safe
Doom vs. Transports-are embarked units affected?
----- I'm not touching this with a 10 foot pole.
Mawlocks/Trygons
Mawlocs- If the blast template is closely surrounded by enemy models, what happens to the Mawloc?
----- Did the math, and it could take as few as 6 models on 1" bases to completely surround the 5" template, not leaving the arriving Mawloc 1" of clearance. (my guess here is move the enemy further, no crowding the sandworms.)
Mawlocs (again)- if they mishap, (say, by scattering off the table), do they return from underground, or the Tyranid table edge?
-----I feel they should return from underground, as this is normal for them. However, I have nothing to support this.
Can Raveners use a Trygon Tunnel?
-----Seems kinda like they should, but RAW seems to say otherwise. (and for fluff, they can dig thier own tunnels)
Spore Mines
Can spore mines assault?
Can VP be earned for destroyed spore mines?
General
Mysetic Spores- What happens when a tank tries to run one over?
Other
Acid Blood- How many wounds?
-----The guys at my LGS pretty much agree, it's limited to how many wounds the critter had. After all, take one Alien from the movie series, add to an industrial orange juicer, and you'll probrably only get so much blood out of the thing.
Feel No Pain/Acid Blood
-Do feel no pain saves still cause acid blood damage?
I'd like to think this is a complete list of things that might be unclear, but I'm not that optimistic. what's anyone else got?