Just a couple of things I wanted to mention.
The Phase 3 and 4 Engr Officer courses are only offered once a year (phase 3 leading straight into phase 4). Phase 3 is offered only in summer, so unless you are on CAP in the winter session, you should expect some time on PAT platoon, or OJE somewhere in the units, until Phase 3 starts.
Another change is that Army Engineers and Construction Engineers now have a common phase 3, with phase 4 being the difference. However, the field ex for phase 4 is combined between the two.
While just about everyone wants to stay in the Regiments and expects to be there for their careers, it is unlikely to happen these days. Partially because we are swinging back to the Infrastructure side of the house, and the fact that we should be hitting our PML (Preferred Manning Level). Because of this, it means shorter stays at the Regiment to ensure that everyone has that check in the box, so expect some time at a Base Construction Unit, or Staff Officer position. Another side effect is that the number of Major promotions is being reduced, so the days of 3-4 yr Captains being promoted to Majors is starting to fall by the wayside.
At as a word of advice, if the career manager wants you to go somewhere (particularly a position for future advancement), take it, unless you want your career to stagnate. As an object lesson, I know someone who was supposed to be posted the regiment, but asked for a compassionate posting so he would not be posted there. Someone else was picked to full in his position. Right now, the former is still a Captain, while the latter is now a Major.