WR upgrade for Patriots?

As a tumultuous offseason continues for the New England Patriots at TE, there has been a lot of talk of particular players that could be brought in as an upgrade at that position -- both FAs and possible trade targets have been identified. But the team also appears to have an underwhelming cast of characters at WR, so the natural inclination is to ponder whether they'll make an addition there as well prior to the start of the season.