Are there any current projects/plans for a VTOL passenger airliner?
US patent 9,475,585 describes a Tilt-Rotor Vertical-Lift Aircraft. This patent was awarded to Boeing on October 25, 2016. The subject aircraft may be anything from a personal aircraft to a regional commercial aircraft for at least 100 passengers. 

The two tilt rotors (36) are powered by a number of turbine engines (40) which are fix mounted under the wings. The novelties claimed by this patent are about the transmission of power from the power plants (engines) to the rotors.

Figure 1 - in vertical mode:


Figure 2 - in horizontal mode:

Images source: United States Patent and Trademark Office, www.uspto.gov

Of course, the filing of a patent is an evidence that a company is spending at least some limited resources to the subject. However, this does not mean that Boeing is actually developing such an aircraft.