On 31 March Royal Mail will issue new definitive stamps in advance of the change in postage rates which takes effect from 6 April.
Four new Machin definitives will be issued:
Of course these colours are Royal Mail descriptions so we can't be sure what they will actually look like until they show us, but the 17p is probably similar to the 18p & 30p, the 22p similar to the old 16p, red has been used a number of times (8p, 26p) and ultramarine is probably the 20½p blue.
New 56p and 90p country definitives will replace the 50p and 81p in existing designs.
578. Stamperija Features The Sacred and The Profane. - On 2 June 2015* Australia Post *will issue a set of 4 stamps and various other items as detailed in Blog 555 on the subject of "Islands of Australia". ...