There are almost two dozen digital SLR lenses are announced in 2010 and these are some interesting one:
Canon EF 8-15mm f/4 L fisheye lens
Another remarkable lens from Canon. This fisheye lens is unique and provide versatility of zoom. Unfortunately, this lens will not available until March 2011. I recommend you to check out short film shot by Canon 5D mark II and 8-15mm f/4 fisheye lens to see what is this lens capable of.
Best with Canon 5D mark II, Canon 1Ds.
Nikon 24mm f/1.4 N Price $2100
A truly remarkable lens that is almost perfect. Produce faultless and very sharp image. The downside is the lens is a bit heavy for prime lens (620g) and expensive ($2200). But it is well worth it. Great for landscape, citiscape and architecture.
Best with: Nikon full frame cameras: Nikon D700, D3, D3s, D3x
Nikon 28-300mm f/3.5-5.6 VR Price $1025
Following the success of Nikon 18-200mm multipurpose lens, Nikon release 28-300mm primarily designed for full frame (FX) cameras. However, this lens is also compatible with Nikon crop sensor camera, such as D300s and D90, when equipped with this lens, the effective focal length will be 42-450mm. This wide and long focal length is great for sports.
Cheaper alternative : Tamron 28-300mm f/3.5-6.3 $369 Best with: Nikon D700, D300s, D7000, D90
When mounted in crop sensor DSLR, 17-50mm equal to 25-75mm which is considered workhorse lens. With a big constant aperture, this lens might stay with your camera 90% of the time. This lens will be available for Nikon, Canon and Sigma. It is a great alternative because it is significantly cheaper than Canon 17-55mm ($990) or Nikon 17-55mm ($1200).
Best with: Any Canon or Nikon non full frame digital SLR cameras
Sony 35mm f/1.8 Price $189
Inexpensive prime lens that is small, and ideal for portrait or low light photography. Because it is a Sony, you will also benefit from built-in “steady shot” I think this lens is a must have for Sony DSLR users on budget.
Best with: Any Sony non-full frame DSLR.