For tournaments, a public liability insurance policy is now required, and for national federation coaches who are traveling and requesting hospitality, there is a registration requirement that will result in a Player Support Team ID.
Three late withdrawals (made after the withdrawal deadline but with ITF notified before the sign-in deadline) are excused and a medical certificate is no longer required for them.
When two matches are required to be played on the same day and the first one was two hours or longer in duration, the rest period is two hours.
The ITF is strongly encouraging the ITF referee be responsible only for that tournament, and not younger age division tournaments that may be played at the same site and time.
The regulations contain a few new references to preserving eligibility for the main draw when it comes to special exemptions, but I'm not familiar enough with the current procedure to comment on what that change entails.
I imagine the following clarification is simply to avoid confusion in selections for Regional Closed Championships: A player who is a dual passport holder must be listed in the ITF database under the nation he/she represents at the Regional Closed Championships.
There is a separate set of regulations for ITF Team Competitions, which include some changes/clarifications for the draws, the new insurance requirement, the number of high-level umpires and "oaths" for players, coaches and officials.
Unfortunately in the Regional competition for North America, there are still only two spots, with one place in the Final 16 going to the host, so when Mexico hosts, that leaves only one spot for the usually strong Canadian and United States teams. The document also contains a complete list of every team's position in every competition from 1991(14s World Junior Tennis) and 1985 (16s Junior Davis Cup and Junior Fed Cup) to the present.
Again, please read through the full documents, which underlines the changes for 2014, and contact the ITF with any questions.
Parenting Aces has been investigating the issues and has gone to the trouble of contacting both TennisLink and Lew Brewer at the USTA to try to understand what the "technical issues" are.
Lisa has also done a thorough review of the USTA Friend at Court for 2014 and discusses the changes in this post. Knowledge is power, as the saying goes.