There has been a lot of discussion on the OCC about the procedure for uploading the IA samples. David Faure, the author of the InThinking Biology site has made this useful summary and gave me permission to copy it. So here it is:

• No need to upload 4/PSOW any more - but you should keep a verson of this in case the IB moderator asks.
• No need to upload the 4/IA form - the tick boxes are now replaced by something on the eCoursework upload system.
• The form 4/ICCC has been changed. There is now a new form on the OCC. It has no second page, and the student signature box is gone.
• After generating the sample there is a form to fill in for the breakdown of the score for each student in the sample.
• The candidate name or number should not be visible on the students work - for anonymity of marking.
  (The file name can include the student's name / number as moderators can't see file names.)
• Candidate details will be attached to uploaded files on the eCoursework upload.
• Biology teachers / IB coordinator are asked to authenticate student work during the upload process which replaces the need for student to sign the 4/ICCC form. 
• Scripts can be annotated by adding visible comments, hidden boxes should be avoided.
• A table justifying the grades can be added to the student script. It doesn't matter if this takes the pages over 12.
• It is the responsibility of schools to keep signed declarations of authenticity from each student for every item of coursework submitted. (see IB Coordinator's notes, February 2016 )
• Marks for each student's IA Investigation are uploaded onto the IB 'IBIS' website and then 'dynamic sampling' takes place which selects the student work required for a moderation sample. 
• Only the moderation sample needs to be uploaded.  For a class of 6 to 20 students this will be 5 investigations.

There are several places to find the information directly from the IB: I strongly advise this.

NEW information released mid Feb 2016 - for summer 2016.
Upload details for Group 4 science subjects for the May 2016 examination session – Internal Assessment (Feb 2016)

IB Coordinator's notes, February 2016 - has a long section on group 4 uploading and checking authenticity

Handbook of procedures for the Diploma Programme 2016

May 2016 - eCoursework user guide (for teachers)

There are a few places where the information had not yet been changed when I looked on 17th Feb.

• In the Physics teacher support material - Frequently asked Questions
• In the Physics guide for 2016 exams