All RIRs have implemented or are discussing some changes to their IPv4 allocation policy that will kick in when they receive their last allocation from IANA (should be any day now).
The changes can be divided into two categories. The first category restricts how many IPv4 addresses each individual account holder can get. The second category sets a number of IPv4 addresses aside for a future unforeseen use. Below is an overview over all the policies. Make sure to take those policies into account when you estimate how many IPv4 addresses will be able to get before all IPv4 pools are depleted.

APNIC

ID: prop-062-v002
Status: Implemented

Restriction: Each APNIC account holder will that meets the criteria for an IPv4 allocation will be eligible to request and receive a single allocation no larger than the minimum allocation size.
Set aside: A /16 will be held in reserve for future uses, as yet unforeseen.

LACNIC

ID: LAC-2008-04
Status: Implemented.

Restriction: LACNIC must reserve a last /12 under a special criteria. However LACNIC notes on the website that they forecast that the reserved space may be incremented to /10 by new allocation policies approved by LACNIC PDP.

set aside: No set aside policy exists or are under discussion.

ARIN

ID: Prop-123 and Prop-124
Status: Discussion

Restriction: When ARIN receives its last /8, by IANA implementing section 10.4.2.2, the length of supply that an organization may request will be reduced. An organization may choose to request up to a 3 month supply of IP addresses.
Set aside: Upon receipt of the last /8 that the IANA will allocate to ARIN per the Global Policy for the Allocation of the Remaining IPv4 Address Space, ARIN will place a contiguous /20 in reserve for Critical Infrastructure.

Interesting to note here is that both these still are proposals. The next ARIN meeting will be in April. The global IANA pool will already be depleted at that time.

AfriNIC

ID: AFPUB-2010-v4-005
Status: Discussion

Restriction: During this phase, allocation/assignment of address space will continue as in the Current phase (/24 for a EU and /22 for a LIR) but the maximum will change from /10 to /13.
Allocations and assignments will be made from the /8 pool until we reach a /11. At this point the Transition to IPv6 phase will kick in.
During this phase a minimum allocation/assignment size will be /27. the maximum allocation/assignment will be /22.
If any LIR or End User requesting IPv4 address space during the Exhaustion Phase does not already have IPv6 address space, then AfriNIC shall allocate or assign an IPv6 address block in compliance with the IPv6 allocation or assignment policies in effect at the time.
The current allocation and assignment period of 12 months shall be changed to 8 months. This will help to ensure that LIRs request only for resources they need in the short to medium term, and promote fairness in the equitable distribution of the last IPv4 address pool.
Set aside: A /12 IPv4 address block will be in reserve out of the Last /8.

RIPE

Status: Concluding (will likely soon be implemented)
ID: 2010-02

Restriction: On application for IPv4 resources LIRs will receive IPv4 addresses according to the following:
a. LIRs may only receive one allocation from this /8. The size of the allocation made under this policy will be exactly one /22.
b. LIRs receive only one /22, even if their needs justify a larger allocation.
c. LIRs may apply for and receive this allocation once they meet the criteria to receive IPv4 address space according to the allocation policy in effect in the RIPE NCC service region at the time of application.
d. Allocations will only be made to LIRs if they have already received an IPv6 allocation from an upstream LIR or the RIPE NCC.
Set aside: A /16 will be held in reserve for some future uses