Twnty twelve theme

The non code way is to use a splash page plugin
http://wordpress.org/plugins/search.php?q=splash+page

The normal way ( need some coding) is to setup a static front page
http://codex.wordpress.org/Creating_a_Static_Front_Page

This static page that set as front page could be using a whole new page template or just regular page but use body_class() to target some elements to be visually removed.

When using CSS to hide thing, use display none for everything excepts page title. For title, use CSS clip instead, this is so that the page has title and it’s most likely to be in H1 tag for SEO purpose.

Example

.page-id-123 .entry-title {
	position: absolute !important;
	clip: rect(1px 1px 1px 1px); /* IE7 */
	clip: rect(1px, 1px, 1px, 1px);
}

123 is the page id