Exactly what's the deal with the new Ambush/Bstab?

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To clean up the equations I posted in the other thread:

Assuming that our subject has fully invested in Lethality, for values of W being weapon damage, A being attack power, and E being enemy damage reduction, the formulas should look like this:

Old System Backstab crit
[((W * 3) + A/14 + 210) * 2.3] * (1 - E)

New System Backstab crit
[(((W + A/14) * 3) + 210) * 2.3] * (1 - E)

Old System Ambush crit
[((W * 3) + A/14 + 290) * 2.3] * (1 - E)

New System Ambush crit
[(((W + A/14) * 3) + 290) * 2.0] * (1 - E)

As far as I'm aware, these should be generally applicable.  To generate numbers for non-critical hits, simply drop the 2.3/2.0 multiplier, which is also what you adjust for less points in Lethality.

Feel free to plug in some statistics and generate some examples.
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stabby do you have a formula for SS?

Edit: Also how (if at all) does weapon speed play a factor? I have seen people do the following:

[(WeaponSpeed * AP/14) + AvgWeaponDmg * 3]