First of all, lets take the Greatsword issue out of the way:
MyISPHatesENWorld said:
Greatsword or 2-handed sword in DND to this point hasn't reflected any specific sword. As the weapon entries don't appear to reference weapon lengths, is there some bit of information leaked that greatsword is now a specific sword that has a length of 70 inches? That's longer than a sword needs to be to be balanced in a way that it works only in two hands and has enough mass to do a lot of damage.
According to this source (
http://www.thearma.org/essays/2HGS.html), historical greatswords measured 60-70 inches (150-175cm) and weighed 5-8 pounds (2.3-3.6 Kg). Please note that this information comes from people who have actually handled both historical specimens and modern replicas. The idea of a 15 pound sword is stupid, to say the least.
My issue about sneak attacking with such a weapon comes from both the amount of room needed to wield it and the fact that it is much much easier to find someones femoral artery or a way to puncture a lung through a small joint in the enemy's plate armor with a knife than with a sword.
Now, as a DM, I might be able to allow it by spending two feats (one for proficiency and another to allow sneak attacking with it), but I'd need to read more of the rules to reach a final decision.
OR, maybe I would help you homebrew an encounter power that grants extra damage when you strike with a heavy weapon against a foe you have combat advantage over.
However, for some strange reason, you have already stated that you don't wish to ask your DM to accommodate your character concept.
MyISPHatesENWorld said:
Race: Half-orcs traditionally had a backstory that won't exist in 4e (I guess they'll be magically created from flowers and honey by a race of anthropomorphic bears or something when they show up). Without that backstory, the way the character interacts with society (and is seen by society) loses a lot. It's easy to fit that same story into a character's past while having it relevant in commonly encountered civilized societies as a human. A pure orc is a too far removed to have the right effect. So, orc is out for sure and half-orc is pretty much certain to have a foo foo background that won't fit. Also, half-orcs looked a lot more human in 1e. In 3.x, the character was described as being exceptionally small and favoring his human side heavily in appearance.
Nothing prevents you from having a "sullen, outcast, born-from-rape halfbreed antisocial character who is not allowed in decent taverns" in your game, using either human or orc stats (or any combination thereof).
Heck, you could have a "sullen, outcast, born-from-rape halfbreed antisocial who is not allowed in decent taverns" anything! Dwarves, elves, eladrin, halflings... any community is prone to have an ugly duckling who is picked on by other kids because his ears are different, or because he has a different skin color.
I personally find your reference to "flowers and honey" as condescending and borderline insulting.
The "all half-orcs are the product of rape" thing may not be "politically correct" and probably wont be the "default" background as in previous books. However, only you (with your DM's help) define who and what your character is.
In my current game, there is a half-orc female fighter who was born after a war. Both Orcs and Humans commited atrocities against each other, and for a while, half orc babies were common on both sides. She was born in an orc tribe and she was the proverbial "runt of the litter", so she had to learn to fight better than her half-brothers and sisters. She refuses to wear heavy armor (I blame Xena for that) and tends to live a bit of a larcenous lifestyle.
Maybe we'll compare notes in a few months when we convert to 4th edition.