The New Frontiers AO Launch Services Information Summary has been revised
effective 12/4/03, and now contains the following paragraph as paragraph 3:

There are two service providers in the intermediate and heavy performance
classes of launch services (the Delta series provided by the Boeing Company
and the Atlas family of launch vehicles provided by Lockheed
Martin). Proposers should seek to be dual compatible with both vehicle
families. However, if a proposal team can identify compelling reason(s)
not to maintain dual LV compatibility, then the proposal team may choose a
single LV for proposal purposes. NASA cannot assure that both launch
service capabilities will continue to be available to support launches in
2010 and beyond, hence proposal teams who elect not to maintain dual LV
compatibility in their proposed investigation must realize that in the
event that their investigation is selected to enter Phase A, the dual
compatibility requirement may be re-imposed. Final assignment of a
specific launch vehicle will occur after NASA conducts a launch service
competition during Phase B. During Phase A and after the selection to
proceed to the following phases, the Phase A cost cap growth rule
(reference New Frontiers Program 2003 AO, Section 5.9.1) will not be
applied solely to the re-imposition of the dual compatibility requirement.

As of December 10, 2003, answers to all of the Preproposal Conference
questions have been provided on the New Frontiers Acquisition and Program
Library web sites (http://newfrontiers.larc.nasa.gov/newfrontiers/ &
http://newfrontiers.larc.nasa.gov/newfrontiers/NFPL.html). Any questions
not addressed on these web pages should be submitted again to the New
Frontiers Program Scientist per the instructions contained in the AO.