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So the Scenario is Blood Angels vs Necrons with the Nemesor.

Blood Angels have three Assault squads held in reserve for Deepstrike, Necrons have Wraiths in reserve.

Top of turn two Blood Angels begin rolling for (3) Assault squads to arrive. The question is at what point(s) can the Necron player interrupt the turn by invoking Phased reinforcements and have the Wraiths Deploy via Deep Strike placement.

1) After Assault Squad 'A' passes it's reserve roll
2) After Assault Squad 'B' passes it's reserve roll
3) After Assault Squad 'C' fails it's reserve roll
4) After Assault Squad 'A' is Deployed via Deep Strike placement rules
5) After Assault Squad 'B' is Deployed via Deep Strike placement rules

The way I read the rules now is that the Wraiths actually deploy onto the table before the Assault Squads, which would really cut down on the tactical application of having them shadow them and near guarantee a charge.

Also, another question with this rule in regards to Flayed Ones. At the start of the game they choose to Outflank. If an opponent's unit arrives from reserve, can they choose to immediately deploy via Deepstrike instead?

In the BRB, page 94, under the heading "Rolling for Reserves":

"Depending on the turn in question, a certain result [on a D6] will mean the unit has arrived."

So as soon as a unit makes a successful reserves roll, it has "arrived."

In the case you described, I guess that would mean that they could arrive after A or B passed its reserve roll.

As you said, since Phased Reinforcements triggers immediately after a unit arrives, you would Deep Strike before the enemy units (and from the way it's worded, it would also trigger before any remaining reserve rolls). Although that last part is based on the interpretation that reserve rolls are not all done simultaneously.

If you do follow that interpretation, then the risk here is that if you don't invoke Phased Reinforcements after unit A arrives and then B doesn't arrive, you've lost your chance to bring in your units. On the other hand, you could invoke the rule, Deep Strike, then find out that a dozen other enemy units are arriving that turn as well.

I'm thinking (4), After Squad 'A' is deployed via Deep Strike placement rules. Although the successful rolling for determine if the unit arrive, it hasn't actually arrived until it's on the table. See, Arriving from reserve also on page 94, "When the unit arrives, it must move onto the table from the controlling player's own table edge (unless it's deep striking or outflanking)." Thus, once a single enemy unit is deployed from reserves, the entire reserved Necron fleet can arrive. Yikes!

4) for the same reasons....