I see three primary movements in American architecture today, all of which are capable of producing both excellent and terrible buildings. These are my own terms:
Neo Traditionalism, which provides basically traditional buildings decorated with ornament. This is very popular with the general public and generally hated by academia. Buildings may or may not be historicist, but in any event they have a lot of details organized in a more or less formal arrangement. Neo Traditionalists use a lot brick. In my opinion, the best well-known Neo Traditional group out there is
Torti Gallas.
Here is an example of one of their buildings.
Neo Modernism, which provides sculptural buildings with clean lines that are generally undecorated, but that function on the idea that the form itself is the decoration. This is very popular with academia and generally unpopular with the public. Neo Modernists use a lot of glass and shiny metals.
Frank Gehry is the most famous example, but I'd also put
generic glass boxes in this category.
Eco Architecture, which I see as a symbiosis of the other two that provides ornament-like details using sculptural-like clean lines. Designs may or may not be formal, may or may not be traditional, and may or may not be primarily sculptural, but in any event repetition of individually clean elements is often an important means of ornamentation. This tends to be popular in academic circles and gets mixed reaction from the general public. Eco Architects always want to get LEED certified, and like to use a lot of wood, often with green hues. Here are
two examples, one of which leans more towards the modern and the other more towards the traditional.