Does the Wall of Force spell in 5e block teleportation? This does not seem to be addressed in the 5e spell description.
No, Wall of Force does not block teleportation. The relevant parts of the spell description are:
Nothing can physically pass through the wall.
This is pretty unambiguous, but teleporting isn't "physically passing" through the wall, so that's fine.
The wall also extends into the Ethereal Plane, blocking ethereal travel through the wall.
This is, admittedly, slightly less clear. However, there is nothing in the description of Teleport that suggests that it involves the Ethereal Plane. In fact, it doesn't really say anything about how it works:
This spell instantly transports you [...] to a destination you select.
The destination you choose must be known to you, and it must be on the same plane of existence as you.
That's all we know. However, there is much more compelling evidence in the description of Forcecage:
If the creature tries to use teleportation or interplanar travel to leave the cage, it must first make a Charisma saving throw. On a success, the creature can use that magic to exit the cage. On a failure, the creature can't exit the cage and wastes the use of the spell or effect. The cage also extends into the Ethereal Plane, blocking ethereal travel.
This is a pretty clear distinction between teleportation and ethereal travel (one is difficult, the other is actually impossible). So they are different, and the barrier to ethereal travel in Wall of Force does not apply to teleportation.