TerryC,
Are you aware of some special feature, quality or circumstance that makes CSX # 4617 "special"?
Yes, it can be retired when CSX management decides to. It may sit on a deadline for x amount of time before disposition, or a lot quicker.
Since CSX # 4617 does not have dash - 2 technology, I expect that it will be retired within a year or so, depending upon the "need" to keep it in active service.
Except for the paint scheme, there is nothing special about this particular unit, and the paint scheme could be redone at any time! Yes, CSX does have a knack for repainting units that they plan to retire soon. It must be that the repainting schedule is based on a fixed time frame / opportunity to repaint.
Keep in mind that CSX has over 100 other SD40 units, based on outward appearance, that are currently in active service. These are former SD40 units that were internally upgraded with Dash - 2 technology and a few other changes, with virtually no changes in their outward appearance. They were assigned road numbers in CSX's 8301 - 8400 + number series.
ACLfan