Apple's iPhone 5 introduced the Lightning connectivity port as well as adapters for older, 30-pin hardware. A Micro USB adapter was also released on Sept. 12, which Apple had to produce to comply with European law.
Apple, RIM, Nokia and nearly every other major mobile phone manufacturer agreed to adopt Micro USB as a charger standard for their devices in 2009. Cellphone charger standards were published by those involved a year later, which stipulated that Micro USB chargers should be "predominant" within two years.
Hence, the Lightning to Micro USB Adapter is now available on UK and French Apple Stores for £15 / €19 (about $25 as of this writing).