Without prior notice to developers who have apps on sale there, Microsoft has introduced a new pricing structure for the Windows Store noting that this "may impact" your app pricing.
As explained in a brief blog post the "consolidated price tier structure" is needed to bring the prices of Windows apps into line with Windows Phone apps to accommodate the idea of the "universal app" that was announced at the BUILD conference.
In the blog post Bernardo Zamora writes:
We’re making changes to the price tiers to achieve two goals:
1) Simplify app pricing for developers by providing a single set of price tiers across Windows and Windows Phone, necessary to support universal Windows apps
2) Increase developer opportunity by adding $0.99 and $1.29 (USD) price points for Windows; apps priced in this range represent 55% of Windows Phone paid transactions today
Both of these point might seem acceptable. What doesn't seem reasonable is that this announcement appeared only after price changes had been made and that devs whose apps were repriced were not consulted about whether their apps should be sold for more or lass than before. Moreover Microsoft appears to be slow to respond to devs who have made complaints.
Microsoft appears not to have changed in its cavalier attitude towards devs despite the encouraging signs at BUILD.