HRT have announced that they are extending their technology sharing agreement to include KERS next year. This will give them advantage over Virgin who I believe are not going to run the technology next year while Team Lotus, or Caterham as they will be next year will be running the energy recovery system.
Williams will simply sell the team their backend from this year as they are switching powertrains next year. If done properly the introduction of KERS will give a decent performance step of up to a second.
Although there are worries surrounding the team with regards to how much development work is going to take place for next years car with very few rule changes little is required to get a legal car but the team are far from competitive.