Rob Bell's church has issued a public clarification:
Ironically, the statement unwittingly confirms that Bell is a universalist in the very process of denying that Bell is a universalist.
LOVE WINS FAQS
[Frequently Asked Questions]
We hope this FAQ helps you interact with the book, Love Wins. For information on Mars Hill’s beliefs, see our Narrative Theology at marshill.org/believe.
Does Love Wins affirm that Jesus is the only way by which we are saved?
Yes. Love Wins is clear, our only hope for reconciliation with God is found in Jesus alone because of all he accomplished through his life, death and resurrection. Rob shares in Love Wins his belief that the only way to God is through Jesus by quoting and affirming Jesus’ statement, “I am the way and the truth and the life. No one comes to the Father except through me” [pg. 154]. Mars Hill affirms that Jesus is the only way to inherit salvation, how exactly that happens, however, is a matter of mystery that we do not claim to have all the answers to. As Rob says after quoting Jesus, “What he doesn’t say is how, or when, or in what manner the mechanism functions that gets people to God through him” [pg. 154].
But so-called evangelical universalism says the same thing. Everyone is saved through the atonement of Christ.
What does Love Wins say about heaven and hell?
Love Wins recognizes heaven and hell to be realities all around us. We see hell everyday through the atrocities of war, famine, human trafficking, broken relationships, and abuse. We also see heaven all around us through acts of love, kindness, and compassion.
There is also the reality of heaven and hell in the future. Our ultimate future hope is a restored creation under Christ where God will dwell with us forever on a restored heaven and earth [Rev 21-22]. There are many who accept the invitation of the life of heaven and many who reject the invitation. Those who reject the invitation experience a purifying “fire” of judgment in hell, yet there is hope. We live in the hope that the redemptive work of Christ is beyond what we can ask or imagine. Love Wins helps us have a biblical imagination that leaves room for the hope of the redemption of all while recognizing humanities free will to continue to reject God.
That is universalism. Hopeful universalism. There is a hell–a purgatorial hell. Hell is remedial punishment. And the possibility of postmortem restoration remains a live option.
Does Love Wins promote Universalism?
No. Rob isn’t suggesting Universalism [all will be saved, regardless of their faith]. He is proposing that God’s love is so big that the invitation to God’s grace may extend into the next life so that all could be saved. Love Wins clearly points to the centrality of Jesus and the work of his life, death, and resurrection and the hope that Christ’s work will bring restoration to all. Jesus is the only way to God. God’s love does not force anyone and there may be those who continue to reject the invitation extended to them. Love Wins speaks often speaks of human freedom [72-73, 103-104, 113, 115, 117]. Rob shares, “Love demands freedom. It always has, and it always will. We are free to resist, reject, and rebel against God’s ways for us. We can have all the hell we want.” 
That's consistent with so-called evangelical universalism and hopeful universalism. According to evangelicalism, people are saved through the atonement of Christ. Moreover, they are saved through faith in Christ. However, that may be postmortem faith in Christ.
Likewise, hopeful universalism doesn't insist that everyone will be saved in the end. Rather, God must always leave the door open.
What matters in hopeful universalism is not that God actually saves everyone, but that the damned are never abandoned by God. God never gives up on them.
There's always the possibility of final restoration. And, conversely, there's always the possibility that some will remain irreconcilables.