Genesis 2.0b1 rtl.css. Add this file as rtl.css to root of child themes, then install RTL Tester plugin, and switch to RTL.

gistfile1.txt

/* WARNING - Please read the notice below:

	This file is part of the core Genesis Framework. DO NOT edit this file under any circumstances. Please do all modifications in the form of a child theme.
	Copy the contents of this file to the child theme. Do not use @import, as the CSS included with Genesis might change in the future.

*/

body {
	direction: rtl;
	unicode-bidi: embed;
}

blockquote::before {
	right: -20px;
	left: auto;
}

.content-sidebar-sidebar .content-sidebar-wrap {
	float: right;
}

.sidebar-content-sidebar .content-sidebar-wrap,
.sidebar-sidebar-content .content-sidebar-wrap {
	float: left;
}

.content {
	float: left;
}

.content-sidebar .content,
.content-sidebar-sidebar .content,
.sidebar-content-sidebar .content {
	float: right;
}

.sidebar-primary {
	float: left;
}

.sidebar-content .sidebar-primary,
.sidebar-sidebar-content .sidebar-primary {
	float: right;
}

.sidebar-secondary {
	float: right;
}

.content-sidebar-sidebar .sidebar-secondary {
	float: left;
}

.five-sixths,
.four-sixths,
.one-fourth,
.one-half,
.one-sixth,
.one-third,
.three-fourths,
.three-sixths,
.two-fourths,
.two-sixths,
.two-thirds {
	float: right;
	margin-right: 2.564102564102564%;
	margin-left: auto;
}

.first {
	margin-right: 0;
	margin-left: auto;
}

.avatar {
	float: right;
}

.alignleft .avatar {
	margin-left: 24px;
	margin-left: 2.4rem;
	margin-right: auto;
}

.alignright .avatar {
	margin-right: 24px;
	margin-right: 2.4rem;
	margin-left: auto;
}

.alignleft {
	float: right;
	text-align: right;
}

.alignright {
	float: left;
	text-align: left;
}

img.alignleft,
.wp-caption.alignleft {
	margin: 0 0 24px 24px;
	margin: 0 0 2.4rem 2.4rem;
}

img.alignright,
.wp-caption.alignright {
	margin: 0 24px 24px 0;
	margin: 0 2.4rem 2.4rem 0;
}

.author-box .avatar {
	margin-left: 24px;
	margin-left: 2.4rem;
	margin-right: auto;
}

.title-area {
	float: right;
}

.header-image .site-header .wrap {
	background-position: right;
}

.header-image .site-title a {
	float: right;
}

.site-header .widget-area {
	float: left;
	text-align: left;
}

.site-header .search-form {
	float: left;
}

.genesis-nav-menu .menu-item {
	text-align: right;
}

.genesis-nav-menu .sub-menu {
	right: -9999px;
	left: auto;
}

.genesis-nav-menu .sub-menu .sub-menu {
	margin: -54px 199px 0 0;
}

.genesis-nav-menu .menu-item:hover > .sub-menu {
	right: auto;
	left: auto;
}

.genesis-nav-menu > .first > a {
	padding-right: 0;
	padding-left: 0;
}

.genesis-nav-menu > .last > a {
	padding-left: 0;
	padding-right: 0;
}

.genesis-nav-menu > .right {
	float: left;
}

.genesis-nav-menu > .rss > a {
	margin-right: 48px;
	margin-right: 4.8rem;
	margin-left: auto;
}

.entry-content ol li,
.entry-content ul li {
	margin-right: 40px;
	margin-right: 4rem;
	margin-left: auto;
}

.entry-meta .entry-comments::before {
	margin: 0 2px 0 6px;
	margin: 0 0.2rem 0 0.6rem;
}

#respond label {
	margin-left: 12px;
	margin-left: 1.2rem;
	margin-right: auto;
}

.comment-list li li {
	margin-left: -32px;
	margin-left: -3.2rem;
	margin-right: auto;
}

li.comment {
	border-left: none;
	border-right: none;
}

.comment .avatar {
	margin: 0 0 24px 16px;
	margin: 0 0 2.4rem 1.6rem;
}

.footer-widgets-1 {
	margin-left: 40px;
	margin-left: 4rem;
	margin-right: auto;
}

.footer-widgets-1,
.footer-widgets-2 {
	float: right;
}

.footer-widgets-3 {
	float: left;
}

That help me a lot.

Thanks