I don't think state law matters very much, because you want to try to escape a clear contract provision based upon allegations of misrepresentation, but have not substantiated a case for any material misrepresentation. The bulk of your complaint boils down to your failure to do due diligence before switching to a new employer. Unless you have an actual, written contract of employment that guarantees you certain duties or perquisites, you are an at-will employee and your employer can change your job assignments and duties consistent with its wants and needs.

A company does not have to refrain from entertaining an offer for a merger or acquisition, merely because they told an employee at one point in time that they weren't actively looking to be acquired. Even assuming that a company is looking to be acquired, that information may be closely held at the top of the company. It's also not material to your situation, as it does not affect your compensation or job duties. If you are laid off or fired as a result of a merger, that will also eliminate any obligation you have to repay relocation costs.

If your department is not included in the new business after the reorganization, is it that everybody in your department will be terminated? If so, have they given an indication as to when that will occur?